本論文實作數位權利管理系統，應用於即時影像串流的應用。本實作系統包含一個憑證伺服器、媒體伺服器及多個IPMP使用者終端機。本系統整合JPEG-2000影像壓縮技術、AES加密標準及區塊重組的內容加密方法，實作出一個主從式的數位權利管理系統。當使用者發出媒體內容存取要求，憑證伺服器根據使用者的憑證，設定用戶端的JPEG-2000解碼器參數，決定用戶所能播放的解析度及品質。並傳送相應的解碼工具程式給使用者端，依照授權的內容來解碼。在即時影像傳輸的過程中，首先從Webcam上擷取CIF格式的影像，然後利用JPEG-2000編碼器進行編碼，接著以區塊重組的方法將壓縮過後的影像進行加密，最後影像透過UDP協定的方式傳送至用戶端。在使用者與伺服器資料交握的階段中，使用者登入的密碼及使用者的憑證皆會以AES來加密，並透過TCP協定的方式進行傳送。實驗結果顯示本論文有效的將IPMP終端、憑證伺服器與媒體中心整合，並提供即時的媒體縮放碼流服務。

We have implemented the digital right management (DRM) system for real-time image streaming. It comprises one license server to identify user’s legal access rights and one media server to provide real-time scalable bitstream to the user IPMP terminal according to the authenticated access rule, i.e., resolution, frame rate or quality. In the handshaking process between a client and the server, the user’s password and user’s certificate will be encrypted with AES algorithm and send by TCP protocol. The media server adopts the JPEG2000 image coder to provide scalable image bitstream, for either off-line media files or on-line media sources, and uses the block-shuffling algorithm to perform content encryption. In our example, it capture images from a real-time webcam and perform encoding and encryption. Finally, it sends the protected image to client by UDP protocol. In words, we have implemented one DRM system that integrates IPMP terminal, license server and media server to provide real-time image streaming service.

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